CloudFormation EC2 & Route53 template

elasticat.json

{
  "AWSTemplateFormatVersion" : "2010-09-09",
  
  "Description" : "Create an EC2 instance, set up Apache, and create Route53 A records",
  
  "Parameters" : {
      
    "KeyName" : {
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the instances",
      "Type" : "String",
      "MinLength": "1",
      "MaxLength": "64",
      "AllowedPattern" : "[-_ a-zA-Z0-9]*",
      "ConstraintDescription" : "can contain only alphanumeric characters, spaces, dashes and underscores.",
      "Default" : "ec2-key"
    },    

    "InstanceType" : {
      "Description" : "WebServer EC2 instance type",
      "Type" : "String",
      "Default" : "t1.micro",
      "AllowedValues" : [ "t1.micro","m1.small","m1.medium","m1.large","m1.xlarge","m2.xlarge","m2.2xlarge","m2.4xlarge","c1.medium","c1.xlarge","cc1.4xlarge","cc2.8xlarge","cg1.4xlarge"],
      "ConstraintDescription" : "must be a valid EC2 instance type."
    },
    "HostedZone" : {
      "Type" : "String",
      "Description" : "The DNS name of an existing Amazon Route 53 hosted zone"
    }
  },
  
  "Mappings" : {
    "AWSInstanceType2Arch" : {
      "t1.micro"    : { "Arch" : "64" },
      "m1.small"    : { "Arch" : "64" },
      "m1.medium"   : { "Arch" : "64" },
      "m1.large"    : { "Arch" : "64" },
      "m1.xlarge"   : { "Arch" : "64" },
      "m2.xlarge"   : { "Arch" : "64" },
      "m2.2xlarge"  : { "Arch" : "64" },
      "m2.4xlarge"  : { "Arch" : "64" },
      "c1.medium"   : { "Arch" : "64" },
      "c1.xlarge"   : { "Arch" : "64" },
      "cc1.4xlarge" : { "Arch" : "64HVM" },
      "cc2.8xlarge" : { "Arch" : "64HVM" },
      "cg1.4xlarge" : { "Arch" : "64HVM" }
    },

    "AWSRegionArch2AMI" : {
      "us-east-1"      : { "32" : "ami-31814f58", "64" : "ami-1b814f72", "64HVM" : "ami-0da96764" },
      "us-west-2"      : { "32" : "ami-38fe7308", "64" : "ami-30fe7300", "64HVM" : "NOT_YET_SUPPORTED" },
      "us-west-1"      : { "32" : "ami-11d68a54", "64" : "ami-1bd68a5e", "64HVM" : "NOT_YET_SUPPORTED" },
      "eu-west-1"      : { "32" : "ami-973b06e3", "64" : "ami-953b06e1", "64HVM" : "NOT_YET_SUPPORTED" },
      "ap-southeast-1" : { "32" : "ami-b4b0cae6", "64" : "ami-beb0caec", "64HVM" : "NOT_YET_SUPPORTED" },
      "ap-northeast-1" : { "32" : "ami-0644f007", "64" : "ami-0a44f00b", "64HVM" : "NOT_YET_SUPPORTED" },
      "sa-east-1"      : { "32" : "ami-3e3be423", "64" : "ami-3c3be421", "64HVM" : "NOT_YET_SUPPORTED" }
    }
  },
    
  "Resources" : {     
      
    "CfnUser" : {
      "Type" : "AWS::IAM::User",
      "Properties" : {
        "Path": "/",
        "Policies": [{
          "PolicyName": "root",
          "PolicyDocument": { "Statement":[{
            "Effect":"Allow",
            "Action":"cloudformation:DescribeStackResource",
            "Resource":"*"
          }]}
        }]
      }
    },

    "HostKeys" : {
      "Type" : "AWS::IAM::AccessKey",
      "Properties" : {
        "UserName" : {"Ref": "CfnUser"}
      }
    },

    "RegionRecord" : {
      "Type" : "AWS::Route53::RecordSet",
      "Properties" : {
        "HostedZoneName" : { "Fn::Join" : [ "", [{"Ref" : "HostedZone"}, "." ]]},
        "Comment" : "DNS name for my instance.",
        "Name" : { "Fn::Join" : [ "", [ {"Ref" : "AWS::Region"}, ".", {"Ref" : "HostedZone"} ,"."]]},
        "Type" : "A",
        "TTL" : "900",
        "ResourceRecords" : [ { "Fn::GetAtt" : [ "EC2instance", "PublicIp" ] } ]
      }
    },

    "HostRecord" : {
      "Type" : "AWS::Route53::RecordSet",
      "Properties" : {
        "HostedZoneName" : { "Fn::Join" : [ "", [{"Ref" : "HostedZone"}, "." ]]},
        "Comment" : "DNS name for my instance.",
        "Name" : { "Fn::Join" : [ "", [{"Ref" : "EC2instance"}, ".", {"Ref" : "AWS::Region"}, ".", {"Ref" : "HostedZone"} ,"."]]},
        "Type" : "A",
        "TTL" : "900",
        "ResourceRecords" : [ { "Fn::GetAtt" : [ "EC2instance", "PublicIp" ] } ]
      }
    },

    "EC2instance": {  
      "Type": "AWS::EC2::Instance",
      "Metadata" : {
        "Comment1" : "Configure the bootstrap helpers to install the Apache Web Server and local cat content",

        "AWS::CloudFormation::Init" : {
          "config" : {
            "packages" : {
              "yum" : {
                "httpd"        : []
              }
            },

            "files" : {
                "/var/www/html/index.html" : {
                        "content" :  { "Fn::Join" : ["", [ "<img src='cat.jpg'><p>", {"Ref" : "AWS::Region"}, "\n" ] ] }
                },
                "/var/www/html/cat.jpg" : {
                        "source" :  { "Fn::Join" : [ "", ["http://strewth_cats.s3.amazonaws.com/", { "Ref" : "AWS::Region"}, ".jpg" ] ] }
                }
            },

            "services" : {
              "sysvinit" : {  
                "httpd" : {
                  "enabled"       : "true",
                  "ensureRunning" : "true"                
                }
              }
            }
          }
        }
      },
      "Properties": {
        "ImageId" : { "Fn::FindInMap" : [ "AWSRegionArch2AMI", { "Ref" : "AWS::Region" },
                          { "Fn::FindInMap" : [ "AWSInstanceType2Arch", { "Ref" : "InstanceType" }, "Arch" ] } ] },
        "InstanceType"   : { "Ref" : "InstanceType" },
        "SecurityGroups" : [ {"Ref" : "WebServerSecurityGroup"} ],
        "KeyName"        : { "Ref" : "KeyName" },
        "UserData"       : { "Fn::Base64" : { "Fn::Join" : ["", [
          "#!/bin/bash -v\n",
          "yum update -y aws-cfn-bootstrap\n",

          "# Helper function\n",
          "function error_exit\n",
          "{\n",
          "  /opt/aws/bin/cfn-signal -e 1 -r \"$1\" '", { "Ref" : "WaitHandle" }, "'\n",
          "  exit 1\n",
          "}\n",

          "# Install local config\n",
          "/opt/aws/bin/cfn-init -v -s ", { "Ref" : "AWS::StackName" }, " -r EC2instance",
          "    --access-key ",  { "Ref" : "HostKeys" },
          "    --secret-key ", {"Fn::GetAtt": ["HostKeys", "SecretAccessKey"]},
          "    --region ", { "Ref" : "AWS::Region" }, " > /var/tmp/cfn-init.output || error_exit 'Failed to run cfn-init'\n",


          "# All is well so signal success\n",
          "/opt/aws/bin/cfn-signal -e 0 -r \"LAMP Stack setup complete\" '", { "Ref" : "WaitHandle" }, "'\n"
        ]]}}        
      }
    },

    "WaitHandle" : {
      "Type" : "AWS::CloudFormation::WaitConditionHandle"
    },

    "WaitCondition" : {
      "Type" : "AWS::CloudFormation::WaitCondition",
      "DependsOn" : "EC2instance",
      "Properties" : {
        "Handle" : {"Ref" : "WaitHandle"},
        "Timeout" : "300"
      }
    },
    
    "WebServerSecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "Enable HTTP access via port 80",
        "SecurityGroupIngress" : [
          {"IpProtocol" : "tcp", "FromPort" : "80", "ToPort" : "80", "CidrIp" : "0.0.0.0/0"}
        ]
      }      
    }          
  },
  
  "Outputs" : {
    "WebsiteURL" : {
      "Value" : { "Fn::Join" : ["", ["http://", { "Ref" : "RegionRecord" } ] ] },
      "Description" : "URL for newly created LAMP stack"
    },
    "HostName" : {
      "Value" : { "Ref" : "HostRecord" }
    }

  }
}